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All propulsion systems generate thrust by

  • A.Reducing the aircraft's weight
  • B.Accelerating a mass of fluid rearward
  • C.Pushing against the surrounding air
  • D.Converting heat directly into motion

Answer: B

Newton's third law gives an equal and opposite reaction to the momentum imparted to the working fluid. Propellers, fans, jets and rockets differ only in how much mass they accelerate and by how much, which is the single idea that unifies the whole subject.

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